SOURCES: David Porter, M.D., director, blood and marrow transplantation, Hospital of the University of Pennsylvania, Philadelphia; Jacqueline Barrientos, M.D., medical oncologist, CLL research and treatment specialist, North Shore-LIJ Cancer Institute, Lake Success, N.Y.; Susanna Greer, Ph.D. director, clinical research and immunology, American Cancer Society; Sept. 2, 2015, Science Translational Medicine